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Derivatives - Foreign Currency Derivative Contracts (Details) - Not Designated as Hedging Instrument $ in Thousands | Mar. 31, 2016 USD ($) $ / £ $ / € $ / NOK $ / CAD | Dec. 31, 2015 USD ($) $ / £ $ / € $ / NOK $ / CAD
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Canadian dollar | Foreign currency contracts |  |
Derivative [Line Items] |  |
Notional Amount | $ 2,989 | $ 5,091
Contractual Exchange Rate | $ / CAD | 1.3384 | 1.3751
Euro | Foreign currency contracts |  |
Derivative [Line Items] |  |
Notional Amount |  | $ 19,706
Contractual Exchange Rate | $ / € |  | 1.0948
Euro | Foreign currency contracts, Settlement Date April 11, 2016 |  |
Derivative [Line Items] |  |
Notional Amount | $ 4,418 |
Contractual Exchange Rate | $ / € | 1.1045 |
Euro | Foreign currency contracts, Settlement Date April 15, 2016 |  |
Derivative [Line Items] |  |
Notional Amount | $ 3,603 |
Contractual Exchange Rate | $ / € | 1.10848 |
Norwegian kroner | Foreign currency contracts |  |
Derivative [Line Items] |  |
Notional Amount | $ 9,341 | $ 11,498
Contractual Exchange Rate | $ / NOK | 8.5646 | 8.6973
Pound sterling | Foreign currency contracts |  |
Derivative [Line Items] |  |
Notional Amount | $ 5,668 | $ 7,516
Contractual Exchange Rate | $ / £ | 1.417 | 1.5031

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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